package com.mianle.userapi.util;

import java.text.SimpleDateFormat;
import java.util.Date;

public class RandomUtils {
    /**
     * 生成随机数
     * @param numberFlag
     * @param length
     * @return
     */
    public static String createRandom(boolean numberFlag, int length){
        String retStr = "";
        String strTable = numberFlag ? "1234567890" : "1234567890abcdefghijkmnpqrstuvwxyz";
        int len = strTable.length();
        boolean bDone = true;
        do {
            retStr = "";
            int count = 0;
            for (int i = 0; i < length; i++) {
                double dblR = Math.random() * len;
                int intR = (int) Math.floor(dblR);
                char c = strTable.charAt(intR);
                if (('0' <= c) && (c <= '9')) {
                    count++;
                }
                retStr += strTable.charAt(intR);
            }
            if (count >= 2) {
                bDone = false;
            }
        } while (bDone);

        return retStr;
    }

    /**
     * 获取当前系统时间的年月日时分秒字符串
     */
    public static String getCurrentTime(){
        Date d = new Date();
        System.out.println(d);
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        String dateNowStr = sdf.format(d);
        return dateNowStr;
    }
}
